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Pinpoint Test A: Shift Interlock System Does Not Release/Lock Correctly

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 TEST THE BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Do the brake lights illuminate? 
    1. YES  : Go to  A7.
    2. NO  : Go to  A2.
  2. A2 TEST FUSE F32 (5A) 
    • Key in OFF position.
    • Check fuse: Fuse F32 (5A)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A4.
    2. NO  : Go to  A3.
  3. A3 TEST CIRCUIT SBP32A (VT/RD) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Brake Pedal Position (BPP) Switch C278
    • Measure the resistance of circuit SBP32A (VT/RD) to ground at BPP switch C278-3.
      Fig 1: Measuring Resistance Of Circuit SBP32A (VT/RD) To Ground At BPP Switch C278-3
      GF0007060Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR circuit SBP32A (VT/RD) for a short to ground. TEST the system for normal operation.
  4. A4 TEST CIRCUIT SBP32A (VT/RD) FOR AN OPEN 
    • Disconnect: Smart Junction Box (SJB) C2280B
    • Measure the resistance of circuit SBP32A (VT/RD) between SJB C2280B-28 and the BPP switch C278-3.
      Fig 2: Measuring Resistance Of Circuit SBP32A (VT/RD) Between SJB C2280B-28 & BPP Switch C278-3
      GF0010395Courtesy of FORD MOTOR CO.
    • Is resistance less than 5 ohms? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR circuit SBP32A (VT/RD) for an open. TEST the system for normal operation.
  5. A5 TEST THE BRAKE PEDAL POSITION (BPP) SWITCH 
    • Measure the resistance of the brake pedal position (BPP) switch between C278-2 and C278-3 while open (OFF) and closed (ON).
      Fig 3: Measuring Resistance Of Brake Pedal Position (BPP) Switch Between C278-2 & C278-3 While Open & Closed
      GF0010396Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the BPP switch in the ON position and greater than 10,000 ohms with the BPP switch in the OFF position? 
    1. YES  : Go to  A6.
    2. NO  : INSTALL a new BPP switch. TEST the system for normal operation.
  6. A6 TEST CIRCUIT CCB15C (BN/GN) FOR A SHORT TO GROUND 
    • Disconnect: Shift Interlock Actuator C2008
    • Measure the resistance of circuit CCB15C (BN/GN) between shift interlock actuator C2008-3 and ground.
      Fig 4: Measuring Resistance Of Circuit CCB15C (BN/GN) Between Shift Interlock Actuator C2008-3 & Ground
      GF0010397Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR circuit CCB15C (BN/GN) for a short to ground. TEST the system for normal operation.
  7. A7 TEST CIRCUIT CCB15C (BN/GN) FOR AN OPEN 
    • Measure the resistance of circuit CCB15C (BN/GN) between shift interlock actuator C2008-3 and the brake pedal position (BPP) switch C278-4.
      Fig 5: Measuring Resistance Of Circuit CCB15C (BN/GN) Between C2008-3 & (BPP) Switch C278-4
      GF0010398Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A8.
    2. NO  : REPAIR circuit CCB15C (BN/GN) for an open. TEST the system for normal operation.
  8. A8 TEST FOR VOLTAGE ON CIRCUIT CBP20G (YE/VT) 
    • Key in ON position.
    • Measure the voltage of circuit CBP20G (YE/VT) at the shift interlock actuator C2008-1.
      Fig 6: Measuring Voltage Of Circuit CBP20G (YE/VT) At Shift Interlock Actuator C2008-1
      GF0007065Courtesy of FORD MOTOR CO.
    • Is voltage greater than 10 volts? 
    1. YES  : Go to  A12.
    2. NO  : Go to  A9.
  9. A9 TEST SJB FUSE F20 (10A) 
    • Key in START position.
    • Check fuse: Fuse F20 (10A)
    • Is the resistance of the fuse less than 5 ohms? 
    1. YES  : Go to  A11.
    2. NO  : Go to  A10.
  10. A10 TEST CIRCUIT CBP20G (YE/VT) FOR A SHORT TO GROUND 
    • Measure the resistance of circuit CBP20G (YE/VT) to ground at shift interlock actuator C2008-1.
      Fig 7: Measuring Resistance Of Circuit CBP20G (YE/VT) To Ground At Shift Interlock Actuator C2008-1
      GF0010399Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A11.
    2. NO  : REPAIR the circuit for a short to ground. TEST the system for normal operation.
  11. A11 TEST CIRCUIT CBP20G (YE/VT) FOR AN OPEN 
    • Measure the resistance of circuit CBP20G (YE/VT) between the shift interlock actuator C2008-1 and the SJB C2280B-15.
      Fig 8: Measuring Resistance Of Circuit CBP20G (YE/VT) Between Shift Interlock Actuator C2008-1 & SJB C2280B-15
      GF0010400Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A12.
    2. NO  : REPAIR circuit CBP20G (YE/VT) for an open. TEST the system for normal operation.
  12. A12 TEST CIRCUIT GD161AC (BK/YE) FOR AN OPEN 
    • Measure the resistance of circuit GD161AC (BK/YE) to ground at the shift interlock actuator C2008-2.
      Fig 9: Measuring Resistance Of Circuit GD161AC (BK/YE) To Ground At Shift Interlock Actuator C2008-2
      GF0007068Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new shift interlock actuator. TEST the system for normal operation.
    2. NO  : REPAIR circuit GD161AC (BK/YE) for an open. TEST the system for normal operation.
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